No ejector extrusion marks gives the impression the round was not over pressure.
When around is fired, the primer partially ejects and its rearward travel is restircted by the bolt face.
The cartridge then travels rearward and re-seats the primer giving the impression that the primer hasn't moved.
In this case ( no pun ) it looks like the primer went rearward but that particular case grabbed the chamber near the neck-shoulder-forward case body and did not travel rearward rapidly enough to recapture the primer, but allowed the case to stretch rearward and bind the bolt enough to allow you to feel resistance.
I could be wrong.